org.hibernate.envers.internal.entities.mapper.relation.OneToOnePrimaryKeyJoinColumnMapper Maven / Gradle / Ivy
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Hibernate's entity version (audit/history) support
/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later.
* See the lgpl.txt file in the root directory or .
*/
package org.hibernate.envers.internal.entities.mapper.relation;
import java.io.Serializable;
import org.hibernate.envers.internal.entities.PropertyData;
import org.hibernate.envers.internal.reader.AuditReaderImplementor;
import org.hibernate.envers.query.AuditEntity;
import org.hibernate.persister.entity.EntityPersister;
import org.hibernate.service.ServiceRegistry;
/**
* Property mapper for {@link javax.persistence.OneToOne} with {@link javax.persistence.PrimaryKeyJoinColumn} relation.
*
* @author Lukasz Antoniak (lukasz dot antoniak at gmail dot com)
*/
public class OneToOnePrimaryKeyJoinColumnMapper extends AbstractOneToOneMapper {
public OneToOnePrimaryKeyJoinColumnMapper(
String entityName,
String referencedEntityName,
PropertyData propertyData,
ServiceRegistry serviceRegistry) {
super( entityName, referencedEntityName, propertyData, serviceRegistry );
}
@Override
protected Object queryForReferencedEntity(
AuditReaderImplementor versionsReader, EntityInfo referencedEntity,
Serializable primaryKey, Number revision) {
if ( referencedEntity.isAudited() ) {
// Audited relation.
return versionsReader.createQuery().forEntitiesAtRevision(
referencedEntity.getEntityClass(),
referencedEntity.getEntityName(), revision
)
.add( AuditEntity.id().eq( primaryKey ) )
.getSingleResult();
}
else {
// Not audited relation.
return createNotAuditedEntityReference(
versionsReader, referencedEntity.getEntityClass(),
referencedEntity.getEntityName(), primaryKey
);
}
}
/**
* Create Hibernate proxy or retrieve the complete object of referenced, not audited entity. According to
* {@link org.hibernate.envers.Audited#targetAuditMode()}} documentation, reference shall point to current
* (non-historical) version of an entity.
*/
private Object createNotAuditedEntityReference(
AuditReaderImplementor versionsReader, Class entityClass,
String entityName, Serializable primaryKey) {
final EntityPersister entityPersister = versionsReader.getSessionImplementor().getFactory().getMetamodel()
.entityPersister( entityName );
if ( entityPersister.hasProxy() ) {
// If possible create a proxy. Returning complete object may affect performance.
return versionsReader.getSession().load( entityClass, primaryKey );
}
else {
// If proxy is not allowed (e.g. @Proxy(lazy=false)) construct the original object.
return versionsReader.getSession().get( entityClass, primaryKey );
}
}
}